A222574 - cp's OEIS frontend

A222574 Number of 2Xn 0..2 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

n	a(n)
1	2
2	1
3	5
4	10
5	25
6	128
7	292
8	1318
9	3640
10	14788
11	42332
12	172442
13	496654
14	2013238
15	5919842
16	23613110
17	70986662
18	279047430
19	854262098
20	3317468446
21	10317918394
22	39625082182
23	125013898578
24	475235749926
25	1518534868610
26	5720236047374

[2, 1, 5, 10, 25, 128, 292, 1318, 3640, 14788, 42332, 172442, 496654, 2013238, 5919842, 23613110, 70986662, 279047430, 854262098, 3317468446, 10317918394, 39625082182, 125013898578, 475235749926, 1518534868610, 5720236047374]

cp's OEIS Frontend

A222574 Number of 2Xn 0..2 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

Table of values

List of values